Cylinder-grinding machine



Nov. 9,1926. 1,606,652

R. J. MARVIN ET AL CYLINDER GRINDING MACHINE Filed Jan. 16, 1925 65Shets-Sheet 1 )2 (LEM mvr-zu'roka ATTORNEY Nov. 9 1926.

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R. J. MARVIN ET AL Filed Jan. 16, 1925 3 Sheets-Shed 2 I Z 1 z I 6 A 4gi 4167*. j I (if o J I 1 01; g m o gt UN 17 35 1 4 4/ I J fi I J59 7 5I J I J (X0 5 Z 6 3/ J4 fl mvem'ons gs wm m ATTORNEY Nov. 9, 1926. 41,606,652

R. J. MARVIN ET AL CYLINDER GBINDING MACHINE Filed an. 16, 1925 sSheets-Sheet 5 2/ 5 i1 'Ilill Y if JZ M x7 1 if (if JJ' 9 m a ZZZ/1012272 6 1E mvzu'rons ATTORNEY Patented Nov. 9,

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RALPH JACOB MARVIN AND CHARLES RICHARD MCMINN, OF LOS ANGELES,CALIFORNIA.

CYLINDER-GRINDING I'viACHINE.

Application filed January 16, 1925.

This invention relates to a machine for boring out or grinding thecylinders of internal combustion engines, pumps and the like, and hasfor its object the provision of a novel machine adapted to be clamped orbolted upon a cylinder block of an engine or the like without it beingnecessary to re move the motor from an automobile or other place'whereit may be permanently mounted, the device being provided with means foroperating a grinding wheel or the like and trueing and dressing out thewalls of a cylinder for the purpose of permitting the installation ofnew or over-sized pistons.

An important object is the provision of a machine of this character inwhich the grinding element is given a planetary movement or in otherwords it is forced to follow a circular path simultaneously with itsrotation whereby all portions of the cylinder walls will be effectuallydressed.

Another object is the provision of a machine of this character which isprovided with a novel feed means whereby the grinding wheel or the likewill bemoved longitudinally of the cylinder while the rotary movement isbeing carried out and in this way it is obvious that all portions of thecylinder wall will be trued.

An additional object is the provision of a device of this characterwhich will be comparatively simple and inexpensive in manufacture, easyto operate and control, positive in action, eflicient and durable inservice, and a general improvement in the art.

With the above and other objects and ad vantages in view, the inventionconsists in the details of construction to be hereinafter more fullydescribed and claimed, and illustrated in the accompanying drawings inwhich:

Figure 1 is a side elevation of the complete device,

Figure 2 is a longitudinal section therethrough,

Figure 3 is a vertical section on the line 33 of Figure 2,

Figure a is a horizontal section on the line 44; of Figure 2,

Figure 5 is a horizontal cross section on the line 55 of Figure 2, and

Figure 6 is a detail section.

Referring more particularly to the drawings, the numeral 10 designatesthe base of the machine which might be formed Serial No. 2,882;

casting or of any desired number of parts suitably fastened together,which base is adapted to be bolted, clamped or otherwise secured uponthe head of a motor, pump or the like which is intended to have thecylinders dressed out or trued. This base 10 constitutes the support forthe entire machine, and mounted above one end portion of the base andsuitably bolted or otherwise secured theretois a housing 11 whichconstitutes a bearing for a sleeve 12 carrying a gear 13 which may beformed integrally therewith. This sleeve is prevented from longitudinalmovement by means of a ring nut 14 screwed thereonto and located andhearing within a recess 15 in the lower por tion of the housing or atthe juncture of the housing with the base.

1 The numeral 16 designates a bearing sleeve held in place on the gear13 by means of bolts or screws 17 which pass through elongated slots 18in an outstanding flange 19 at the lower end of the sleeve 16 and whichengage within suitable threaded holes 20 in the gear 13. In order thatadjustment of'the sleeve 16 with respect to the gear may be made, wemake use of a cam screw 21 which is adapted to be turned whereby toshift the sleeve 16 bodily with respect to the gear 13 so as to beeccentric with respect thereto. If desired, this screw may be graduatedin any preferred manner in order to permit of accurate adjustment. Owingto the fact that this sleeve 16 may be shifted on the gear 13, it isobvious that there will be caused an eccentric motion when the gear 13is rotated, and as the sleeve 16 carries the spindle for the grindingwheel to; be described it is obvious that the grinding wheel will have acircular motion in addition to the rotary movement imparted thereto bymeans to be described, this adjustment is of vital importance inasmuchas it enables the de vice to be used satisfactorily in grinding outcylinders of different diameters. Located within the sleeve 16 is thefeed screw 22 which is tubular in formation and through which isjournaled the spindle 23 upon the lower end. of which is suitablymounted and secured a. grinding disc 24: of emery, carborundum or thelike. The spindle is incapable of longitudinal movement within the screw22 and is suitably supported at its upper and lower ends by Timkenxorother suitable roller bearings indicated at l Secured upon the upper endof the spindle is a bevel gear 26 meshing with a bevel gear 27 carriedby a counter shaft 28 suitably journaled in a. bracket member 29 andadapted to be rotated in any desired manner by means of a motor or otherpower device. In actual practice it is probable that the feed ofrotation of the spindle would be in the neighborhood of from threethousandv to five thousand revolutions per minute as this is a verysatisfactory speed for the operation of the grinding wheel.

In order that the eccentric motion may be obtained, we provide a shaft30 journaled in bearings 31 rising from the base 10 and carrying a bevelgear 32 meshing with a bevel gear 33 on the lower end of a counter shaft34. journaled in a bracket extension 35 on the housing 11. The shaft 34carries a pinion 36 meshing with the gear 13 for effecting rotationthereof. The shaft 30 may be driven in any desired manner by means ofpower or by engagement of a hand crank 87 thereon.

In order that the feed of the device may be accomplished so that thegrinding wheel will be moved longitudinally of the cylinder, we providea shaft 38 journaled in suitable .bearings 39 and fOfll'ld adapted to berotated by means of the above described crank handle 37 which is shownin the drawings as applied thereto, though it should be understood thatif desired this crank handle might be removed and engaged upon the endof the shaft 80 though this is not illustrated. The shaft 38 carries abevel gear il meshing with a bevel gear 42 on a shaft 43 with which isconnected a tumbling shaft 4L4 which is in turn connected with a shaftd5 journaled through a bracket member 46 projecting from one side of ahousing 16. lhe shaft 45 carries a spur gear a? meshing with anintermediate gear 48 journaled on a stub 49 carried by the bracketextension l6 and meshing with a gear 50 which is formed or otherwiseprovided with a hub 51 which is internally threaded and has screwedengagement with the feed screw 22. Longitudinal displace ment of thegear 50 is prevented by means of a grub s new 52 or the like whichengages within a peripheral groove 53 in the hub of the gear. Obviously,when the shaft 38 is rotated the gear 50 will be driven and as its hubportion 51 is threaded and engaged upon the screw 22, the screw will be'moved longitudinally, carrying with it the spindle 23 and grindingwheel 2a thereon.

The shafts 30 and 38 really operate in unison inasmuch as they areprovided respectively with spur gears 5a and 55, which mesh as shown.The gear 55 is formed on acollar 56 upon which is mounted a spur gear 57adapted to be brought into mesh with a spur gear 58 on the shaft 30. Thecollar 58 is grooved as shown at 59 and enaged within this groove is aforked end 60 f a shifting lever 61 which is pivoted at 62 upon asuitable bracket 63 and which is provided for the purpose of Shiftingthe men'ibers 55, $6 and 57 as a unit so as to bring the desired gearsinto mesh depending upon the direction in which it is desired to effectrotation of the feed screw. Obviously there must be an intermediate gearin order to eii'ect reverse rotation.

l Vhcn the gear 13 is rotated as above described and the reciprocatorymovement is accomplished, it is quite obvious that the sleeve 16 andparts carried thereby will move with respect to the base and mechaismmounted thereon. it therefore becomes necessary to compensate for thismovement, and in carrying out this feature, we provide the extension 46with an elongated slot 65 within w ich is engaged a roller v66 carriedby a bolt 67 or the like which is threaded into the upper end of abracket extension 68 on the bearing member 40. It is to compensate forthis peculiar eccentric movement that we have provided the tumblingshaft a l connecting the shaft of the gears 42 and i7.

While it is of course true that the shaft members 28 and 30 may beseparately operated we may find it convenientin some instances to effectsimultaneous driving of these two elements. In order that this may beaccomplished we provide a suitable flexible shaft 69 connected at oneend with the shaft 28 and connected at its other end with a short shaft70 journaled througlian extension on the bracket 31 and carrying a bevelgear T2 meshing with a bevel gear '73 on the shaft 30. y

-From the foregoing description and a study of the drawings it will beapparent that we have thus provided a simply constructed, easilyoperated and highly eiiicient machine which will readily operate todress out, rebore or regrind and consequently true the cylinders oninternal combustion or other types of engines, and which is also equallycapable of use in connection with stationary motors, pumps or otherdevices without it being ncccssaryto dismount the engines from theirassociated parts or their permanent locations.

i v hile we haveshown and described the preferred embodiment of theinvention,'it should be understood that we reserve the right to makesuch changes in the form,

construction and arrangement of parts as will not depart from the spiritof the invention or the scope of the subjoined claim.

Having thus described the invention, we claim:

In a machine of the character described, a base, a housing risingtherefrom, a sleeve member rotatably mounted within the housing andcarrying a gear, a bearing sleeve disposed upon the gear and formed witha radial slot, a securing member passing through said slot into saidgear, cam means for shifting said bearing sleeve with respect to saidgear whereby to be eccentriethereto, a tubular feed screw journaled andslidable through the bearing sleeve, a nut member rotatably mounted atthe upper end of the bearing sleeve and threaded onto said Screw, aspindle journaled through said screw and provided with means forefi'eoting rotation thereof, a grinding element carried by said spindle,said nut member being formed with a gear, an intermediate gear meshingwith said last named gear, a drive gear meshing with said intermediategear, an operating shaft, and a transmission between said operatingshaft and the last named gear including a coupling shaft.

In testimony whereof we aifix our signa- 2 tures.

RALPH JACOB MARVIN. CHARLES RICHARD MoMINN.

